int WINAPI ConvertNameToReal( const char *Src, char *Dest, int DestSize );
NULL.
NULL,
DestSize is ignored.
"\\?\Volume{273872e0-5e49-11d5-b614-0080ad70bb9b}\Foo.bar"
"D:\Foo\Bar\1092\readme.txt" will return
"C:\work\Doc\1092\readme.txt".